feat: implement query and queryResultCount on stats

[markwylde]

This enhancement provides more detailed insights into query operations, making it easier to:

• Debug complex queries
• Monitor query performance
• Analyze query patterns and results

This is a backward-compatible enhancement to the existing statistics system.

Changes

• Added additional metadata to query operation statistics events
• Now tracking the actual query object used and the number of results returned
• Added comprehensive test coverage for the new statistics fields

Details

The PR enhances the statistics tracking for query operations by including:

• The actual query object used (query field)
• The number of results returned (queryResultCount field)

Types

Updated StatsEvent type to include new optional fields:

• query?: object
• queryResultCount?: number